"sneak" in the noun sense
1. sneak
a person who is regarded as underhanded and furtive and contemptible
2. prowler, sneak, stalker
someone who prowls or sneaks about usually with unlawful intentions
3. fink, snitch, snitcher, stoolpigeon, stool pigeon, stoolie, sneak, sneaker, canary
someone acting as an informer or decoy for the police
"sneak" in the verb sense
1. sneak, mouse, creep, pussyfoot
to go stealthily or furtively
"..stead of sneaking around spying on the neighbor's house"
2. sneak
put, bring, or take in a secretive or furtive manner
"sneak a look"
"sneak a cigarette"
3. pilfer, cabbage, purloin, pinch, abstract, snarf, swipe, hook, sneak, filch, nobble, lift
make off with belongings of others
4. slip, sneak
pass on stealthily
"He slipped me the key when nobody was looking"
"sneak" in the adjective sense
1. furtive, sneak, sneaky, stealthy, surreptitious
marked by quiet and caution and secrecy taking pains to avoid being observed
"a furtive manner"
"a sneak attack"
"stealthy footsteps"
"a surreptitious glance at his watch"
Source: WordNet® (An amazing lexical database of English)
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